NFPA T3.28.9 : 1989

Section one - General<br>0 Introduction<br>1 Scope and field of application<br>2 References<br>3 Terms and definitions<br>4 Symbol rules<br>5 Line techniques<br>Section two - Symbols - Input devices<br>6 Symbols - Manual controls<br>7 Symbols for position sensors<br>8 Symbols for pressure sensors<br>9 Symbols for temperature sensors<br>10 Symbols for flow sensors<br>Section three - Power control valves and interfaces<br>11 Solenoid operated valves<br>12 Counters<br>13 Mechanical timers<br>14 Power control valves<br>15 Symbols for pressure switches<br>Section four - Attached method of diagramming (logic<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;devices)<br>16 Graphic symbols, attached method<br>17 Diagram rules, attached method<br>18 Logic diagrams, attached method<br>Section five - Detached method of diagramming (relay<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;valves and logic devices)<br>19 Symbols for relay valves<br>20 Symbols for off-return fluid memory relay valves<br>21 Symbols for time delay valves<br>22 Counters<br>23 Symbols for resistance devices<br>24 Symbols for relay valves in a timing circuit<br>25 Symbols for one-shot relay valves<br>26 Symbols for electric-to-air relay valves<br>Section six - Miscellaneous devices<br>27 Visual indicators<br>28 Test point<br>29 Pressure indicator<br>30 Pressure gage<br>31 Pressure control valve (pressure regulation)<br>32 Fluid containers<br>33 Check valve<br>34 Shuttle valve (two-input passive OR)<br>35 Identification statement<br>Tables<br>1 Typical push button symbols<br>2 Typical limit valve symbols<br>3 Truth table for AND output<br>4 Truth table for OR output<br>5 Truth table for NOT output<br>6 Truth table for inhibitor (non-implication) output<br>7 Truth table for fluid memory device<br>8 Truth table for flip-flop device<br>9 Truth table for one shot device<br>10 Truth table for delay, timing in<br>11 Truth table for delay, timing out<br>12 Truth table for amplifier device<br>Annexes<br>A Symbol cross reference chart<br>B References<br>C Sample diagrams - Attached method<br>D Sample power control diagram<br>E Sample diagrams - Detached method<br>F Sample power control diagram

Updated graphic symbols for fluid logic devices and circuits by development of symbols for sensing and input devices, interface devices, and accessory devices, all commonly used with fluid logic systems.